Detectives scour through the French supermarket where Lakdim was gunned down

"She's gone to talk to him – to try and get him to drop his weapons, and give up," said a source at the scene. "His sister is there too."

Chilling reports claim the killer dropped his little sister off at school before launching the terrifying attack in the British expat haven of Carcassonne.

Lakdim, who lived with his mother and four sisters at a council estate in Carcassonne, was known to the Directorate General of Homeland Security (DGSI), a police source told Le Parisien.

He is understood to have been "very active" on online jihadi forums and was subject to an S-file, which means the intelligence services considered him a security threat.

A woman linked to him, believed to be a relative, was tonight arrested as President Emmanuel Macron confirmed three were killed and 16 were injured — including a hero cop who traded places with a hostage.

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Earlier this month, French president Emmanuel Macron said "France will strike" if chemical weapons were ever used against civilians in the Syrian civil war.

The Foreign Office says terrorists are "very likely to try to carry out attacks in France" due to the "ongoing threats to France by Islamist terrorist groups".

It advises: "You should be vigilant in public places and follow the advice of local French authorities.

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